MSM PCIe

MSM PCI express root complex

Required properties:
  - compatible: should be "qcom,pci-msm"
  - cell-index: defines root complex ID.
  - #address-cells: Should provide a value of 0.
  - reg: should contain PCIe register maps.
  - reg-names: indicates various resources passed to driver by name.
		Should be "parf", "phy", "dm_core", "elbi", "conf", "io", "bars".
		These correspond to different modules within the PCIe core.
  - ranges: For details of ranges properties, please refer to:
    "Documentation\devicetree\bindings\pci\pci.txt"
  - interrupts: Should be in the format <0 1 2> and it is an index to the
		interrupt-map that contains PCIe related interrupts.
  - #interrupt-cells: Should provide a value of 1.
  - #interrupt-map-mask: should provide a value of 0xffffffff.
  - interrupt-map:  Must create mapping for the number of interrupts
		    that are defined in above interrupts property.
		    For PCIe device node, it should define 12 mappings for
		    the corresponding PCIe interrupts supporting the specification.
  - interrupt-names: indicates interrupts passed to driver by name.
		     Should be "int_msi", "int_a", "int_b", "int_c", "int_d",
		     "int_pls_pme", "int_pme_legacy", "int_pls_err",
		     "int_aer_legacy", "int_pls_link_up",
		     "int_pls_link_down", "int_bridge_flush_n",
		     "msi_0", "msi_1", "msi_2", "msi_3",
		     "msi_4", "msi_5", "msi_6", "msi_7",
		     "msi_8", "msi_9", "msi_10", "msi_11",
		     "msi_12", "msi_13", "msi_14", "msi_15",
		     "msi_16", "msi_17", "msi_18", "msi_19",
		     "msi_20", "msi_21", "msi_22", "msi_23",
		     "msi_24", "msi_25", "msi_26", "msi_27",
		     "msi_28", "msi_29", "msi_30", "msi_31"
		     These correspond to the standard PCIe specification to support
		     MSIs, virtual IRQ's (INT#), link state notifications.
  - perst-gpio: PERST GPIO specified by PCIe spec.
  - wake-gpio: WAKE GPIO specified by PCIe spec.
  - <supply-name>-supply: phandle to the regulator device tree node.
    Refer to the schematics for the corresponding voltage regulators.
    vreg-1.8-supply: phandle to the analog supply for the PCIe controller.
    vreg-3.3-supply: phandle to the analog supply for the PCIe controller.
    vreg-0.9-supply: phandle to the analog supply for the PCIe controller.

Optional Properties:
  - qcom,<supply-name>-voltage-level: specifies voltage levels for supply.
    Should be specified in pairs (max, min, optimal), units uV.
  - clkreq-gpio: CLKREQ GPIO specified by PCIe spec.
  - qcom,ep-gpio: GPIO which enables a certain type of endpoint for link training.
  - pinctrl-names: The state name of the pin configuration.
    supports: "default", "sleep"
  - pinctrl-0: For details of pinctrl properties, please refer to:
    "Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt"
  - pinctrl-1: For details of pinctrl properties, please refer to:
    "Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt"
  - clocks: list of clock phandles
  - clock-names: list of names of clock inputs.
		     Should be "pcie_0_pipe_clk", "pcie_0_ref_clk_src",
				"pcie_0_aux_clk", "pcie_0_cfg_ahb_clk",
				"pcie_0_mstr_axi_clk", "pcie_0_slv_axi_clk",
				"pcie_0_ldo";
  - max-clock-frequency-hz: list of the maximum operating frequencies stored
				in the same order of clock names;
  - qcom,l0s-supported: L0s is supported.
  - qcom,l1-supported: L1 is supported.
  - qcom,l1ss-supported: L1 sub-states (L1ss) is supported.
  - qcom,aux-clk-sync: The AUX clock is synchronous to the Core clock to
    support L1ss.
  - qcom,common-clk-en: Enables the common clock configuration for the endpoint.
  - qcom,clk-power-manage-en: Enables the clock power management for the
    endpoint.
  - qcom,n-fts: The number of fast training sequences sent when the link state
    is changed from L0s to L0.
  - qcom,pcie-phy-ver: version of PCIe PHY.
  - qcom,use-19p2mhz-aux-clk: The frequency of PCIe AUX clock is 19.2MHz.
  - qcom,ep-wakeirq: The endpoint will issue wake signal when it is up, and the
    root complex has the capability to enumerate the endpoint for this case.
  - qcom,msi-gicm-addr: MSI address for GICv2m.
  - qcom,msi-gicm-base: MSI IRQ base for GICv2m.
  - qcom,ext-ref-clk: The reference clock is external.
  - iommus: the phandle and stream IDs for the SMMU used by this root
    complex. This should be used in separate nodes from the main root
    complex nodes, and is the only property needed in that case.
  - qcom,common-phy: There is a common phy for all the Root Complexes.
  - qcom,smmu-exist: PCIe uses a SMMU.
  - qcom,ep-latency: The time (unit: ms) to wait for the PCIe endpoint to become
    stable after power on, before de-assert the PERST to the endpoint.
  - qcom,cpl-timeout: Completion timeout value. This value specifies the time range
    which the root complex will send out a completion packet if there is no response
    from the endpoint.
  - linux,pci-domain: For details of pci-domains properties, please refer to:
    "Documentation/devicetree/bindings/pci/pci.txt"
  - qcom,tlp-rd-size: The max TLP read size (Calculation: 128 times 2 to the
    tlp-rd-size power).
  - Refer to "Documentation/devicetree/bindings/arm/msm/msm_bus.txt" for
    below optional properties:
	- qcom,msm-bus,name
	- qcom,msm-bus,num-cases
	- qcom,msm-bus,num-paths
	- qcom,msm-bus,vectors-KBps
  - qcom,scm-dev-id: If present then device id value is passed to secure channel
	manager(scm) driver. scm driver uses this device id to restore PCIe
	controller related security configuration after coming out of the controller
	power collapse.

Example:

	pcie0: qcom,pcie@fc520000 {
		compatible = "qcom,msm_pcie";
		cell-index = <0>;
		#address-cells = <0>;
		reg = <0xfc520000 0x2000>,
		      <0xfc526000 0x1000>,
		      <0xff000000 0x1000>,
		      <0xff001000 0x1000>,
		      <0xff100000 0x1000>,
		      <0xff200000 0x100000>,
		      <0xff300000 0xd00000>;
		reg-names = "parf", "dm_core", "elbi",
				"conf", "io", "bars";
		ranges = <0x01000000 0x0 0x0c200000 0x0c200000 0x0 0x100000>,
			<0x02000000 0x0 0x0c300000 0x0c300000 0x0 0xd00000>;
		interrupt-parent = <&pcie0>;
		interrupts = <0 1 2 3 4 5 6 7 8 9 10 11
				12 13 14 15 16 17 18 19 20
				21 22 23 24 25 26 27 28 29
				30 31 32 33 34 35 36 37 38
				39 40 41 42 43>;
		#interrupt-cells = <1>;
		interrupt-map-mask = <0xffffffff>;
		interrupt-map = <0x0 0x0 0x0 0 &intc 0 405 0
				0x0 0x0 0x0 1 &intc 0 244 0
				0x0 0x0 0x0 2 &intc 0 245 0
				0x0 0x0 0x0 3 &intc 0 247 0
				0x0 0x0 0x0 4 &intc 0 248 0
				0x0 0x0 0x0 5 &intc 0 249 0
				0x0 0x0 0x0 6 &intc 0 250 0
				0x0 0x0 0x0 7 &intc 0 251 0
				0x0 0x0 0x0 8 &intc 0 252 0
				0x0 0x0 0x0 9 &intc 0 253 0
				0x0 0x0 0x0 10 &intc 0 254 0
				0x0 0x0 0x0 11 &intc 0 255 0
				0x0 0x0 0x0 12 &intc 0 448 0
				0x0 0x0 0x0 13 &intc 0 449 0
				0x0 0x0 0x0 14 &intc 0 450 0
				0x0 0x0 0x0 15 &intc 0 451 0
				0x0 0x0 0x0 16 &intc 0 452 0
				0x0 0x0 0x0 17 &intc 0 453 0
				0x0 0x0 0x0 18 &intc 0 454 0
				0x0 0x0 0x0 19 &intc 0 455 0
				0x0 0x0 0x0 20 &intc 0 456 0
				0x0 0x0 0x0 21 &intc 0 457 0
				0x0 0x0 0x0 22 &intc 0 458 0
				0x0 0x0 0x0 23 &intc 0 459 0
				0x0 0x0 0x0 24 &intc 0 460 0
				0x0 0x0 0x0 25 &intc 0 461 0
				0x0 0x0 0x0 26 &intc 0 462 0
				0x0 0x0 0x0 27 &intc 0 463 0
				0x0 0x0 0x0 28 &intc 0 464 0
				0x0 0x0 0x0 29 &intc 0 465 0
				0x0 0x0 0x0 30 &intc 0 466 0
				0x0 0x0 0x0 31 &intc 0 467 0
				0x0 0x0 0x0 32 &intc 0 468 0
				0x0 0x0 0x0 33 &intc 0 469 0
				0x0 0x0 0x0 34 &intc 0 470 0
				0x0 0x0 0x0 35 &intc 0 471 0
				0x0 0x0 0x0 36 &intc 0 472 0
				0x0 0x0 0x0 37 &intc 0 473 0
				0x0 0x0 0x0 38 &intc 0 474 0
				0x0 0x0 0x0 39 &intc 0 475 0
				0x0 0x0 0x0 40 &intc 0 476 0
				0x0 0x0 0x0 41 &intc 0 477 0
				0x0 0x0 0x0 42 &intc 0 478 0
				0x0 0x0 0x0 43 &intc 0 479 0>;
		interrupt-names = "int_msi", "int_a", "int_b", "int_c", "int_d",
				"int_pls_pme", "int_pme_legacy", "int_pls_err",
				"int_aer_legacy", "int_pls_link_up",
				"int_pls_link_down", "int_bridge_flush_n",
				"msi_0", "msi_1", "msi_2", "msi_3",
				"msi_4", "msi_5", "msi_6", "msi_7",
				"msi_8", "msi_9", "msi_10", "msi_11",
				"msi_12", "msi_13", "msi_14", "msi_15",
				"msi_16", "msi_17", "msi_18", "msi_19",
				"msi_20", "msi_21", "msi_22", "msi_23",
				"msi_24", "msi_25", "msi_26", "msi_27",
				"msi_28", "msi_29", "msi_30", "msi_31";
		perst-gpio = <&msmgpio 70 0>;
		wake-gpio = <&msmgpio 69 0>;
		clkreq-gpio = <&msmgpio 68 0>;
		qcom,ep-gpio = <&tlmm 94 0>;

		gdsc-vdd-supply = <&gdsc_pcie_0>;
		vreg-1.8-supply = <&pma8084_l12>;
		vreg-0.9-supply = <&pma8084_l4>;
		vreg-3.3-supply = <&wlan_vreg>;

		qcom,vreg-1.8-voltage-level = <1800000 1800000 1000>;
		qcom,vreg-0.9-voltage-level = <950000 950000 24000>;

		pinctrl-names = "default", "sleep";
		pinctrl-0 = <&pcie0_clkreq_default &pcie0_perst_default &pcie0_wake_default>;
		pinctrl-1 = <&pcie0_clkreq_sleep &pcie0_perst_sleep &pcie0_wake_sleep>;

		clocks = <&clock_gcc clk_gcc_pcie_0_pipe_clk>,
			<&clock_rpm clk_ln_bb_clk>,
			<&clock_gcc clk_gcc_pcie_0_aux_clk>,
			<&clock_gcc clk_gcc_pcie_0_cfg_ahb_clk>,
			<&clock_gcc clk_gcc_pcie_0_mstr_axi_clk>,
			<&clock_gcc clk_gcc_pcie_0_slv_axi_clk>,
			<&clock_gcc clk_pcie_0_phy_ldo>,
			<&clock_gcc clk_gcc_pcie_phy_0_reset>;

		clock-names = "pcie_0_pipe_clk", "pcie_0_ref_clk_src",
				"pcie_0_aux_clk", "pcie_0_cfg_ahb_clk",
				"pcie_0_mstr_axi_clk", "pcie_0_slv_axi_clk",
				"pcie_0_ldo";
		max-clock-frequency-hz = <125000000>, <0>, <1000000>,
						<0>, <0>, <0>, <0>;
		qcom,l0s-supported;
		qcom,l1-supported;
		qcom,l1ss-supported;
		qcom,aux-clk-sync;
		qcom,n-fts = <0x50>;
		qcom,pcie-phy-ver = <1>;
		qcom,ep-wakeirq;
		qcom,msi-gicm-addr = <0xf9040040>;
		qcom,msi-gicm-base = <0x160>;
		qcom,ext-ref-clk;
		qcom,tlp-rd-size = <0x5>;
		qcom,common-phy;
		qcom,smmu-exist;
		qcom,ep-latency = <100>;
		qcom,cpl-timeout = <0x2>;

		iommus = <&anoc0_smmu>;

		qcom,msm-bus,name = "pcie0";
		qcom,msm-bus,num-cases = <2>;
		qcom,msm-bus,num-paths = <1>;
		qcom,msm-bus,vectors-KBps =
				<45 512 0 0>,
				<45 512 500 800>;

		qcom,scm-dev-id = <11>;
	};